Closure for joints of sectional collapsible cores.



APPLICATION FILED FEB. 27. I915- Patented Sept. 21, 1915.

JOHN B. WALKER, OF BIRMINGHAM, ALABAMA.

CLOSURE ronaom'rs or VSECTYIONAL. GOLLAPSIBLE corms.

Specification of Letters Patent.

Patented Sept. 21, 1915.

Application filed February 27, 1915. Serial No. 11,098.

I '0 all whom it may concern Be it known that 1, JOHN B. WALKER, acitizen of the United States of America, residing at Birmingham, in thecounty of Jefferson and State of Alabama, have invented certain new anduseful Improvements in Closures for Joints of Sectional CollapsibleCores, of which the following is a specification.

My invention relates to a venting joint for the sections of collapsiblecores of all types, and my object is to provide a novel type of jointwhich will permit of. the free collapsing of the sections of a corebarrel while preventing the sand fromv interfering with the inwardrelative movements of the sections in collapsing.

Heretofore the joints of collapsible cores have been protected either byinserting a wooden or metal strip into the joint to substantially closeit while the core is being rammed and, after pouring, either removingthe metal strip or burning out the wooden strip to relieve the corebarrel and permit its collapse; orthe core sections have been soconnected to a core plunger or bar that one or more sections are drawnin advance of the others, but in this latter construct-ion the meetingedges of the sections were either brought'into engagement .during theramming of the core, or their joint was closed by a metal or woodenstrip in the manner above described.

There are serious objections both structurally and economically to theuse of the means as above described for closing the joints ofcollapsible core barrels and the object of my invention is to devise ajoint construction which would avoid the objections to the aboveconstructions; which would require no differential or ,tiinedrelativemovements of the core barrelsections; and which would require noinsertion or removal of a filling means into the joints.

Obviously the preferred arrangement is one in which the'joint closingdevices are carried by and permanently'attaehed to or integral with thecore barrel sections so that no separate manipulation or attachment ofthe joint closing devices is required and they will move freely with thecore barrel sections as they are expanded or. contracted.

lVhere my invention is applied to the making of cores for ingot moldsand heavy hollow castings ofthat character which-it is des irable to"ram upon a jarring machine, the

advantage of having the joint closing devices permanently attached tothe core barrel and the sections of the latter held rigidly expanded bythe core plunger, is of great importanc'e, because the provision of anyloose or lost-motion connection between the plunger and any one of thecore barrel sections to permit it to collapse in advance of the othersections would be a fatal defect when rammed on the jarring machine.

The principles of construction underlying my improved joint closuremakes it available for all types of collapsible cores regardless of thecharacter of the article to be molded thereabout and though I haveillustrated as applied to an ingot mold core, I do so without intentionto thereby limit myself to any particular type of core barrel.

Referring to the-accompanying drawings which illustrate my invention:Figure l is a corner elevation of an ingot mold partly broken away andillustrating the sections in expanded position ready to be rammed. Fig.2 is a crosssectional view of Fig. 1. Fig. 3 is an enlarged sectionalview .of a cover showing the adjacent barrel sections expanded; and Fig.l is a view similar to Fig. 3 and illustrating the manner in which thecore barrel sections clear themselves of the sand at a corner forremoval therefrom. Fig. 5 is an enlarged fragmental side View of thejoint parts.

Similar reference numerals refer to similar parts throughout thedrawings.

Referring to the illustrative embodiment of my invention shown in thedrawings, I form the core barrel of two similar side sections 1 and twosimilar end sections 2, and I connect the several sections to a centralplunger or bar 3 by means of toggle links 4 which are pivotallyconnected at their inner ends to the plunger in the manner described inmy Letters Patent No. 997,027, or in any other suitable manner, and attheir outer ends these links are pivotally connected to lugs 5 on theinner walls of the several sections. The plunger has a shoulder (notshown) near its lower end which is adapted to engage the drag 6 and thelower end of the plunger projects below the drag and is perforated toreceive a looking wedge key 7. The plunger is also perforated at itsupper end to receive a wedge key 8 by means of whlch a top retainingplate- 9 is wedged down upon the expended core barrel sections. Thisconstruction of the core barrel is similar to that described in my saidLetters Patent, but, as hereinbefore stated, may be widely variedaccording to the use for which the core barrel is designed.

In describing the corner joint in its preferred embodiment it will benoted that the edges of the solid plates or core barrel sections 1 and 2are substantially spaced, providing what would be a Wide joint ofseveral inches in large ingot molds except for the means for closing thejoint which will now. be described, Along each inside corner edge of thesections 1 I provide an equidistantly spaced series of fingers 10, theouter faces of which along each edge lie in a plane inclined inwardly atan acute angle to the plane of the outer face of the section 1. Theouter ends of these fingers standopposite the side margin of the innerface of the side sections2 but are spaced therefrom, when the barrel isexpanded, a substantial distance, say about an inch (see Fig. The barrelsections 2 are provided along their inside corner edges with fingers 11which are similar to the fingers 10 but are staggered with relationthereto so as to come. opposite the spaces between the fingers 10. Thefingers 11 lie in a plane inclined inwardly at an acute angle to theouter face of the sections 2 so as to stand substantially parallel withbut outwardly spaced from the plane of the adjacent fingers 10. It willbe noted that the ends of the fingers 11 stand opposite the end edges 12of the sections 1.

and are spaced therefrom substantially the same distance that the endsof the fingers 10 are spaced from the sides 2. Also the inner faces 13of the fingers 11 are preferably inclined to correspond with theinclination of the outer faces of fingers 10. In

my preferred arrangement the space be-.

tween the fingers on a section is greater in width than the width of thefingers 10 or 11 so that when the sections of the core barrel are inexpanded position ready to receive'the sand, a clearance is provided bythe alternating or staggered arrangement of the fingers 10 and 11 ineach joint which forms an irregular or zig-zag venting space which iscontinuous throughout the length of the joint and is preferably'ofuniform width. Moreover this clearance is increased by the extent thatthe fingers 11 are spaced outwardly beyond the plane of the fingers 10.The clearance as thus provided can be as great as under good practice isconsidered safe for holding the sand. The fingers as shown taper inthickness from the barrel section outwardly, and all fingers are equalin size and preferably of narrow width. After the sand has been rammedabout the core barrel, as shown in Fig. 3, the collaps- 7 ing operationof the core barrel is as follows: By releasing the plunger 3 the core 7hind the receding sections 1. The only sand -which can prevent the freecollapse of the core barrel is that which may collect between thefingers 11 and the end edges 12 of the section land as this sand isreadily broken out in the manner described, the barrel is free tocollapse, it being obvious that no sand can collect between the fingers10 or the fingers 11, and if it does it would not interfere with thecollapsing operation as these fingers never interlock and in fact thespace between the plane of the outer faces of the fingers 10 and of theinner faces .ofthe fingers 11 increases as the core collapses. Thesefingers 10 and 11 of each oint therefore present staggered devicespreferably in difierent planes which co-act to form a ventilating jointclosure which will effectively hold the sand during the ramming of thecore. 7 l

The advantage of making the fingers 10 and 11 relatively narrow is thatIthereby increase the venting clearance in the joint and I obtain astrong corner for the core barrel without permitting any substantialpacking of the sand-between the fingers 11 and the shoulder 12. Thewidth of the fingers may be increased within the scope of my inventionbut not beyond the point where suflicient sand can pack between theshoulder 12 on one side and the adjacent edge of a section 2 and itsfingers 11 on the other side, to interfere with the collapsing of thecore barrel or weaken the corners of the core.

Inasmuch as I claim to be the first to sue means a venting closure ofthe collapsible vcore barrel joint, I desire to claim the same broadlywithout being limited to the'details of construction as hereinbeforedescribedin their preferred embodiment.

Having thus described my invention, what I claim as new and desire tosecure by Letters Patent, is j I V r 7 1.111 a joint for collapsiblecorebarrels, a plurality of spaced inwardly inclined projectionsalong theadjacent edges of the barrel sections, the projections on one .coresection being disposed opposite and adapted to partially close thespaces between the pro jections on the other core section, substantiallyas described. 7 Y

2. In a joint for collapsible core barrels, a series of inturned fingersalong each side edge of a'barrel section, the fingers on one sectionedge being disposed opposite the spaces between the fingers of anadjacent section edge, and the ends of the fingers on each section beingspaced from the other section.

3. In a venting joint closure for collapsible cores, a series of fingersdisposed along each core section edge at the joint, the fingers alongthe spaced edges of a joint being disposed in staggered relation and indifferent planes.

4. The combination, with a sectional core and means to contract thesections toward each other, of a venting joint closure for the sectionswhen expanded formed by a series of spaced fingers, the fingers on onesection being disposed opposite to and being narrower than the oppositespaces between fingers on the other section, and one set of fingersbeing disposed to the outside of the other set of co-acting fingers,substantially as described.

5. A joint closure for collapsible core barrels comprising twoco-related sets of fingers which extend only part way across the jointwhen the barrel is expanded and are substantially of equal width andtaper outwardly in thickness, the fingers of one set being disposedopposite to the spaces between the opposite set of fingers,substantially as described.

6. A corner joint for collapsible core barrels comprising, incombination with the barrel sections, a set of spaced fingers along anedge of one barrel section, the outer face of which fingers lie in aplane inclined slightly inwardly across the joint, a set of fingerscarried by the other section edge and set inwardly from its outer edgeto dispose their outer faces inwardly of the first mentioned set offingers, the outer faces of said latter set of fingers being inclined ina plane parallel with the plane of the inner faces of the other set offingers and disposed opposite the spaces between the fingers of saidlatter set, substantially as described.

7 In a corner joint for collapsible core barrels, the combination withthe barrel sections, of a series of staggered fingers along the adjacentedges thereof, the fingers being inwardly inclined and outwardlytapering in thickness and of relatively narrow uniform width and havingtheir ends spaced from the opposite section when the core barrel isexpanded, substantially as described.

8. In a joint closure for sectional collapsible cores, means to drawadjacent sections inwardly in lines at right angles to each other,fingers along the corner edges of the sections, the fingers on onesection being opposite the spaces between the fingers on the othersections and being spaced from said other section when in expandedposition, substantially as described.

In testimony whereof I affix my signature in presence of two witnesses.

JOHN B. WALKER.

Witnesses:

NOMIE WELSH, H. S. Scor'r.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. G.

